Wind chills of minus 35 to 65 are expected through the period. Exposed skin can get frostbite in as little as 5 minutes when the wind chill is 50 below, and Twin Cities metro area wind chills are expected to be minus 50 or lower from Tuesday evening through early Wednesday morning, then in the 40s below zero the remainder of Wednesday into early Thursday.Ron TondraMeteorologist, Updraft Blog